Do you mean subset? It was first standardized as 802.3. Contention under CSMA/CD meant it was not scalable - as in it became inefficient as the segment grew. Bu

Do you mean subset? It was first standardized as 802.3. Contention under CSMA/CD meant it was not scalable - as in it became inefficient as the segment grew. But you're right and I stand corrected in sense of the header/frame length ratio. I'd edit that first sentence if I still could.